Synthesis, crystal structure, and magnetic properties of a series of binuclear lanthanide compounds derived from the 4-Bromo-2-((quinolin-8-ylimino)methyl)phenol ligand

Temperature dependence of the in-phase (χ′) and out-of-phase (χ″) ac susceptibilities of [Dy2(L)2(CH3CH2CH2COO)2(NO3)2(MeOH)2] under a 2 kOe dc field with an oscillating field of 2 Oe in the frequency range 100–1000 Hz. An energy barrier of Ueff ≈ 27.08 K and a pre-exponential factor of τ0 ≈ 4.12 × 10−6 s were obtained by fitting the dynamic magnetic data to an Arrhenius rate law, and [Gd2(L)2(CH3CH2CH2COO)2(NO3)2(MeOH)2] has a weak ferromagnetic interaction. [Display omitted] •Four Ln compounds based on 8-aminoquinoline Schiff ligands have been synthesized.•[Dy2(L)2(CH3CH2CH2COO)2(NO3)2(MeOH)2] showed that a slow relaxation of magnetization.•[Gd2(L)2(CH3CH2CH2COO)2(NO3)2(MeOH)2] may have weak ferromagnetic interaction. A series of binuclear lanthanide compounds, derived from the Schiff-base ligand 4-bromo-2-((quinolin-8-ylimino)methyl)phenol (HL), namely [Ln2(L)2(CH3CH2CH2 COO)2(NO3)2(MeOH)2] (Ln = Gd (1), Tb (2), Dy (3), Ho (4)), has been synthesized. Compounds 1–4 have a similar dinuclear lanthanide core bridged by a butyrate ion. Magnetic studies reveal that compound 1 has a weak ferromagnetic interaction. On the other hand, compound 3 displays slow magnetic relaxation under an external dc field with the anisotropic barrier of 27.08 K and pre-exponential factor τ0 = 4.12 × 10−6 s. Therefore the Dy(III) compound is a field-induced SMM.